Dylan

Dylan is a functional, object-oriented, dynamic programming language with four goals: high performance, rapid prototyping, ease of use, and seamless support for libraries coded in C. It is an interesting hybrid system. Linguistically, and syntactically it is rather C-like. At its base, it is very functional and Lisp-like, using Lisp functional aspects and compiler technology, but with no Symbolic EXPressions (SEXP, S-exp), or ability to manipulate programs as lists. Everything is an object, so it is a pure object-oriented language. It has many other interesting, useful traits.

Open Dylan A full-featured implementation of the Dylan language with a powerful IDE and a command-line compiler. The compiler is currently available for Windows, Linux, and Mac OS X (x86 and PPC). The IDE only works on Windows until the GTK backend for DUIM is finished. It's formally known as Functional Developer and as Harlequin Dylan.